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e4b2356c07d31fbeeabb13b2fb47db703b473080
third_party_mesa3d/src/mesa/drivers/osmesa/osmesa.c
Brian Paul e4b2356c07 Major check-in of changes for GL_EXT_framebuffer_object extension. 
Main driver impacts:
- new code for creating the Mesa GLframebuffer
- new span/pixel read/write code
Some drivers not yet updated/tested.
2005-05-04 20:11:35 +00:00

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/*
* Mesa 3-D graphics library
* Version: 6.3
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Off-Screen Mesa rendering / Rendering into client memory space
*
* Note on thread safety: this driver is thread safe. All
* functions are reentrant. The notion of current context is
* managed by the core _mesa_make_current() and _mesa_get_current_context()
* functions. Those functions are thread-safe.
*/
#include "glheader.h"
#include "GL/osmesa.h"
#include "context.h"
#include "extensions.h"
#include "framebuffer.h"
#include "fbobject.h"
#include "imports.h"
#include "mtypes.h"
#include "renderbuffer.h"
#include "array_cache/acache.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "swrast/s_context.h"
#include "swrast/s_depth.h"
#include "swrast/s_lines.h"
#include "swrast/s_triangle.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"
#include "drivers/common/driverfuncs.h"
/*
* This is the OS/Mesa context struct.
* Notice how it includes a GLcontext. By doing this we're mimicking
* C++ inheritance/derivation.
* Later, we can cast a GLcontext pointer into an OSMesaContext pointer
* or vice versa.
*/
struct osmesa_context {
GLcontext mesa; /* The core GL/Mesa context */
GLvisual *gl_visual; /* Describes the buffers */
GLframebuffer *gl_buffer; /* Depth, stencil, accum, etc buffers */
GLenum format; /* either GL_RGBA or GL_COLOR_INDEX */
void *buffer; /* the image buffer */
GLint width, height; /* size of image buffer */
GLint rowlength; /* number of pixels per row */
GLint userRowLength; /* user-specified number of pixels per row */
GLint rshift, gshift; /* bit shifts for RGBA formats */
GLint bshift, ashift;
GLint rInd, gInd, bInd, aInd;/* index offsets for RGBA formats */
GLchan *rowaddr[MAX_HEIGHT]; /* address of first pixel in each image row */
GLboolean yup; /* TRUE -> Y increases upward */
/* FALSE -> Y increases downward */
};
/* Just cast, since we're using structure containment */
#define OSMESA_CONTEXT(ctx) ((OSMesaContext) (ctx->DriverCtx))
/**********************************************************************/
/*** Private Device Driver Functions ***/
/**********************************************************************/
static const GLubyte *
get_string( GLcontext *ctx, GLenum name )
{
(void) ctx;
switch (name) {
case GL_RENDERER:
#if CHAN_BITS == 32
return (const GLubyte *) "Mesa OffScreen32";
#elif CHAN_BITS == 16
return (const GLubyte *) "Mesa OffScreen16";
#else
return (const GLubyte *) "Mesa OffScreen";
#endif
default:
return NULL;
}
}
static void
osmesa_update_state( GLcontext *ctx, GLuint new_state )
{
/* easy - just propogate */
_swrast_InvalidateState( ctx, new_state );
_swsetup_InvalidateState( ctx, new_state );
_ac_InvalidateState( ctx, new_state );
_tnl_InvalidateState( ctx, new_state );
}
static void
set_buffer( GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit )
{
/* separate read buffer not supported */
ASSERT(buffer == ctx->DrawBuffer);
ASSERT(bufferBit == BUFFER_BIT_FRONT_LEFT);
}
/*
* Just return the current buffer size.
* There's no window to track the size of.
*/
static void
get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
{
/* don't use GET_CURRENT_CONTEXT(ctx) here - it's a problem on Windows */
GLcontext *ctx = (GLcontext *) _glapi_get_context();
(void) buffer;
if (ctx) {
OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
*width = osmesa->width;
*height = osmesa->height;
}
}
/**********************************************************************/
/***** Read/write spans/arrays of pixels *****/
/**********************************************************************/
/* RGBA */
#define NAME(PREFIX) PREFIX##_RGBA
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = osmesa->rowaddr[Y] + 4 * (X)
#define INC_PIXEL_PTR(P) P += 4
#if CHAN_TYPE == GL_FLOAT
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[0] = MAX2((VALUE[RCOMP]), 0.0F); \
DST[1] = MAX2((VALUE[GCOMP]), 0.0F); \
DST[2] = MAX2((VALUE[BCOMP]), 0.0F); \
DST[3] = CLAMP((VALUE[ACOMP]), 0.0F, CHAN_MAXF)
#else
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[0] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[2] = VALUE[BCOMP]; \
DST[3] = VALUE[ACOMP]
#endif
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = SRC[0]; \
DST[GCOMP] = SRC[1]; \
DST[BCOMP] = SRC[2]; \
DST[BCOMP] = SRC[3]
#include "swrast/s_spantemp2.h"
/* BGRA */
#define NAME(PREFIX) PREFIX##_BGRA
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = osmesa->rowaddr[Y] + 4 * (X)
#define INC_PIXEL_PTR(P) P += 4
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[2] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[0] = VALUE[BCOMP]; \
DST[3] = VALUE[ACOMP]
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = SRC[2]; \
DST[GCOMP] = SRC[1]; \
DST[BCOMP] = SRC[0]; \
DST[BCOMP] = SRC[3]
#include "swrast/s_spantemp2.h"
/* ARGB */
#define NAME(PREFIX) PREFIX##_ARGB
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = osmesa->rowaddr[Y] + 4 * (X)
#define INC_PIXEL_PTR(P) P += 4
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[1] = VALUE[RCOMP]; \
DST[2] = VALUE[GCOMP]; \
DST[3] = VALUE[BCOMP]; \
DST[0] = VALUE[ACOMP]
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = SRC[1]; \
DST[GCOMP] = SRC[2]; \
DST[BCOMP] = SRC[3]; \
DST[BCOMP] = SRC[0]
#include "swrast/s_spantemp2.h"
/* RGB */
#define NAME(PREFIX) PREFIX##_RGB
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = osmesa->rowaddr[Y] + 4 * (X)
#define INC_PIXEL_PTR(P) P += 3
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[0] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[2] = VALUE[BCOMP]
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = SRC[0]; \
DST[GCOMP] = SRC[1]; \
DST[BCOMP] = SRC[2]; \
DST[BCOMP] = CHAN_MAX
#include "swrast/s_spantemp2.h"
/* BGR */
#define NAME(PREFIX) PREFIX##_BGR
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = osmesa->rowaddr[Y] + 4 * (X)
#define INC_PIXEL_PTR(P) P += 3
#define STORE_PIXEL(DST, X, Y, VALUE) \
DST[2] = VALUE[RCOMP]; \
DST[1] = VALUE[GCOMP]; \
DST[0] = VALUE[BCOMP]
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = SRC[2]; \
DST[GCOMP] = SRC[1]; \
DST[BCOMP] = SRC[0]; \
DST[BCOMP] = CHAN_MAX
#include "swrast/s_spantemp2.h"
/* 16-bit BGR */
#if CHAN_TYPE == GL_UNSIGNED_BYTE
#define NAME(PREFIX) PREFIX##_RGB_565
#define FORMAT GL_RGBA
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLushort *P = (GLushort *) osmesa->rowaddr[Y] + (X)
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
*DST = ( (((VALUE[RCOMP]) & 0xf8) << 8) | (((VALUE[GCOMP]) & 0xfc) << 3) | ((VALUE[BCOMP]) >> 3) )
#define FETCH_PIXEL(DST, SRC) \
DST[RCOMP] = ( (((*SRC) >> 8) & 0xf8) | (((*SRC) >> 11) & 0x7) ); \
DST[GCOMP] = ( (((*SRC) >> 3) & 0xfc) | (((*SRC) >> 5) & 0x3) ); \
DST[BCOMP] = ( (((*SRC) << 3) & 0xf8) | (((*SRC) ) & 0x7) ); \
DST[ACOMP] = CHAN_MAX
#include "swrast/s_spantemp2.h"
#endif /* CHAN_TYPE == GL_UNSIGNED_BYTE */
/* color index */
#define NAME(PREFIX) PREFIX##_CI
#define FORMAT GL_COLOR_INDEX8_EXT
#define SPAN_VARS \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLubyte *P = osmesa->rowaddr[Y] + (X)
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
*DST = VALUE[0]
#define FETCH_PIXEL(DST, SRC) \
DST = SRC[0]
#include "swrast/s_spantemp2.h"
/**********************************************************************/
/***** Optimized line rendering *****/
/**********************************************************************/
#if CHAN_TYPE == GL_FLOAT
#define PACK_RGBA(DST, R, G, B, A) \
do { \
(DST)[0] = MAX2( R, 0.0F ); \
(DST)[1] = MAX2( G, 0.0F ); \
(DST)[2] = MAX2( B, 0.0F ); \
(DST)[3] = CLAMP(A, 0.0F, CHAN_MAXF);\
} while (0)
#else
#define PACK_RGBA(DST, R, G, B, A) \
do { \
(DST)[osmesa->rInd] = R; \
(DST)[osmesa->gInd] = G; \
(DST)[osmesa->bInd] = B; \
(DST)[osmesa->aInd] = A; \
} while (0)
#endif
#define PACK_RGB(DST, R, G, B) \
do { \
(DST)[0] = R; \
(DST)[1] = G; \
(DST)[2] = B; \
} while (0)
#define PACK_BGR(DST, R, G, B) \
do { \
(DST)[0] = B; \
(DST)[1] = G; \
(DST)[2] = R; \
} while (0)
#define PACK_RGB_565(DST, R, G, B) \
do { \
(DST) = (((int) (R) << 8) & 0xf800) | (((int) (G) << 3) & 0x7e0) | ((int) (B) >> 3);\
} while (0)
#define UNPACK_RED(P) ( (P)[osmesa->rInd] )
#define UNPACK_GREEN(P) ( (P)[osmesa->gInd] )
#define UNPACK_BLUE(P) ( (P)[osmesa->bInd] )
#define UNPACK_ALPHA(P) ( (P)[osmesa->aInd] )
#define PIXELADDR1(X,Y) (osmesa->rowaddr[Y] + (X))
#define PIXELADDR2(X,Y) (osmesa->rowaddr[Y] + 2 * (X))
#define PIXELADDR3(X,Y) (osmesa->rowaddr[Y] + 3 * (X))
#define PIXELADDR4(X,Y) (osmesa->rowaddr[Y] + 4 * (X))
/*
* Draw a flat-shaded, RGB line into an osmesa buffer.
*/
#define NAME flat_rgba_line
#define CLIP_HACK 1
#define SETUP_CODE \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx); \
const GLchan *color = vert1->color;
#define PLOT(X, Y) \
do { \
GLchan *p = PIXELADDR4(X, Y); \
PACK_RGBA(p, color[0], color[1], color[2], color[3]); \
} while (0)
#ifdef WIN32
#include "..\swrast\s_linetemp.h"
#else
#include "swrast/s_linetemp.h"
#endif
/*
* Draw a flat-shaded, Z-less, RGB line into an osmesa buffer.
*/
#define NAME flat_rgba_z_line
#define CLIP_HACK 1
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define SETUP_CODE \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx); \
const GLchan *color = vert1->color;
#define PLOT(X, Y) \
do { \
if (Z < *zPtr) { \
GLchan *p = PIXELADDR4(X, Y); \
PACK_RGBA(p, color[RCOMP], color[GCOMP], \
color[BCOMP], color[ACOMP]); \
*zPtr = Z; \
} \
} while (0)
#ifdef WIN32
#include "..\swrast\s_linetemp.h"
#else
#include "swrast/s_linetemp.h"
#endif
/*
* Analyze context state to see if we can provide a fast line drawing
* function, like those in lines.c. Otherwise, return NULL.
*/
static swrast_line_func
osmesa_choose_line_function( GLcontext *ctx )
{
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (CHAN_BITS != 8) return NULL;
if (ctx->RenderMode != GL_RENDER) return NULL;
if (ctx->Line.SmoothFlag) return NULL;
if (ctx->Texture._EnabledUnits) return NULL;
if (ctx->Light.ShadeModel != GL_FLAT) return NULL;
if (ctx->Line.Width != 1.0F) return NULL;
if (ctx->Line.StippleFlag) return NULL;
if (ctx->Line.SmoothFlag) return NULL;
if (osmesa->format != OSMESA_RGBA &&
osmesa->format != OSMESA_BGRA &&
osmesa->format != OSMESA_ARGB) return NULL;
if (swrast->_RasterMask==DEPTH_BIT
&& ctx->Depth.Func==GL_LESS
&& ctx->Depth.Mask==GL_TRUE
&& ctx->Visual.depthBits == DEFAULT_SOFTWARE_DEPTH_BITS) {
return (swrast_line_func) flat_rgba_z_line;
}
if (swrast->_RasterMask == 0) {
return (swrast_line_func) flat_rgba_line;
}
return (swrast_line_func) NULL;
}
/**********************************************************************/
/***** Optimized triangle rendering *****/
/**********************************************************************/
/*
* Smooth-shaded, z-less triangle, RGBA color.
*/
#define NAME smooth_rgba_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define INTERP_ALPHA 1
#define SETUP_CODE \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define RENDER_SPAN( span ) \
GLuint i; \
GLchan *img = PIXELADDR4(span.x, span.y); \
for (i = 0; i < span.end; i++, img += 4) { \
const GLdepth z = FixedToDepth(span.z); \
if (z < zRow[i]) { \
PACK_RGBA(img, FixedToChan(span.red), \
FixedToChan(span.green), FixedToChan(span.blue), \
FixedToChan(span.alpha)); \
zRow[i] = z; \
} \
span.red += span.redStep; \
span.green += span.greenStep; \
span.blue += span.blueStep; \
span.alpha += span.alphaStep; \
span.z += span.zStep; \
}
#ifdef WIN32
#include "..\swrast\s_tritemp.h"
#else
#include "swrast/s_tritemp.h"
#endif
/*
* Flat-shaded, z-less triangle, RGBA color.
*/
#define NAME flat_rgba_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define SETUP_CODE \
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx); \
GLuint pixel; \
PACK_RGBA((GLchan *) &pixel, v2->color[0], v2->color[1], \
v2->color[2], v2->color[3]);
#define RENDER_SPAN( span ) \
GLuint i; \
GLuint *img = (GLuint *) PIXELADDR4(span.x, span.y); \
for (i = 0; i < span.end; i++) { \
const GLdepth z = FixedToDepth(span.z); \
if (z < zRow[i]) { \
img[i] = pixel; \
zRow[i] = z; \
} \
span.z += span.zStep; \
}
#ifdef WIN32
#include "..\swrast\s_tritemp.h"
#else
#include "swrast/s_tritemp.h"
#endif
/*
* Return pointer to an accelerated triangle function if possible.
*/
static swrast_tri_func
osmesa_choose_triangle_function( GLcontext *ctx )
{
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (CHAN_BITS != 8) return (swrast_tri_func) NULL;
if (ctx->RenderMode != GL_RENDER) return (swrast_tri_func) NULL;
if (ctx->Polygon.SmoothFlag) return (swrast_tri_func) NULL;
if (ctx->Polygon.StippleFlag) return (swrast_tri_func) NULL;
if (ctx->Texture._EnabledUnits) return (swrast_tri_func) NULL;
if (osmesa->format != OSMESA_RGBA &&
osmesa->format != OSMESA_BGRA &&
osmesa->format != OSMESA_ARGB) return (swrast_tri_func) NULL;
if (ctx->Polygon.CullFlag &&
ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
return (swrast_tri_func) NULL;
if (swrast->_RasterMask == DEPTH_BIT &&
ctx->Depth.Func == GL_LESS &&
ctx->Depth.Mask == GL_TRUE &&
ctx->Visual.depthBits == DEFAULT_SOFTWARE_DEPTH_BITS) {
if (ctx->Light.ShadeModel == GL_SMOOTH) {
return (swrast_tri_func) smooth_rgba_z_triangle;
}
else {
return (swrast_tri_func) flat_rgba_z_triangle;
}
}
return (swrast_tri_func) NULL;
}
/* Override for the swrast triangle-selection function. Try to use one
* of our internal triangle functions, otherwise fall back to the
* standard swrast functions.
*/
static void
osmesa_choose_triangle( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
swrast->Triangle = osmesa_choose_triangle_function( ctx );
if (!swrast->Triangle)
_swrast_choose_triangle( ctx );
}
static void
osmesa_choose_line( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
swrast->Line = osmesa_choose_line_function( ctx );
if (!swrast->Line)
_swrast_choose_line( ctx );
}
#define OSMESA_NEW_LINE (_NEW_LINE | \
_NEW_TEXTURE | \
_NEW_LIGHT | \
_NEW_DEPTH | \
_NEW_RENDERMODE | \
_SWRAST_NEW_RASTERMASK)
#define OSMESA_NEW_TRIANGLE (_NEW_POLYGON | \
_NEW_TEXTURE | \
_NEW_LIGHT | \
_NEW_DEPTH | \
_NEW_RENDERMODE | \
_SWRAST_NEW_RASTERMASK)
/**
* Don't use _mesa_delete_renderbuffer since we can't free rb->Data.
*/
static void
osmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
_mesa_free(rb);
}
/**
* Allocate renderbuffer storage. We don't actually allocate any storage
* since we're using a user-provided buffer.
* Just set up all the gl_renderbuffer methods.
*/
static GLboolean
osmesa_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
GLenum internalFormat, GLuint width, GLuint height)
{
const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
if (osmesa->format == OSMESA_RGBA) {
rb->GetRow = get_row_RGBA;
rb->GetValues = get_values_RGBA;
rb->PutRow = put_row_RGBA;
rb->PutMonoRow = put_mono_row_RGBA;
rb->PutValues = put_values_RGBA;
rb->PutMonoValues = put_mono_values_RGBA;
}
else if (osmesa->format == OSMESA_BGRA) {
rb->GetRow = get_row_BGRA;
rb->GetValues = get_values_BGRA;
rb->PutRow = put_row_BGRA;
rb->PutMonoRow = put_mono_row_BGRA;
rb->PutValues = put_values_BGRA;
rb->PutMonoValues = put_mono_values_BGRA;
}
else if (osmesa->format == OSMESA_ARGB) {
rb->GetRow = get_row_ARGB;
rb->GetValues = get_values_ARGB;
rb->PutRow = put_row_ARGB;
rb->PutMonoRow = put_mono_row_ARGB;
rb->PutValues = put_values_ARGB;
rb->PutMonoValues = put_mono_values_ARGB;
}
else if (osmesa->format == OSMESA_RGB) {
rb->GetRow = get_row_RGB;
rb->GetValues = get_values_RGB;
rb->PutRow = put_row_RGB;
rb->PutMonoRow = put_mono_row_RGB;
rb->PutValues = put_values_RGB;
rb->PutMonoValues = put_mono_values_RGB;
}
else if (osmesa->format == OSMESA_BGR) {
rb->GetRow = get_row_BGR;
rb->GetValues = get_values_BGR;
rb->PutRow = put_row_BGR;
rb->PutMonoRow = put_mono_row_BGR;
rb->PutValues = put_values_BGR;
rb->PutMonoValues = put_mono_values_BGR;
}
#if CHAN_TYPE == GL_UNSIGNED_BYTE
else if (osmesa->format == OSMESA_RGB_565) {
rb->GetRow = get_row_RGB_565;
rb->GetValues = get_values_RGB_565;
rb->PutRow = put_row_RGB_565;
rb->PutMonoRow = put_mono_row_RGB_565;
rb->PutValues = put_values_RGB_565;
rb->PutMonoValues = put_mono_values_RGB_565;
}
#endif
else if (osmesa->format == OSMESA_COLOR_INDEX) {
rb->GetRow = get_row_CI;
rb->GetValues = get_values_CI;
rb->PutRow = put_row_CI;
rb->PutMonoRow = put_mono_row_CI;
rb->PutValues = put_values_CI;
rb->PutMonoValues = put_mono_values_CI;
}
else {
_mesa_problem(ctx, "bad pixel format in osmesa renderbuffer_storage");
}
return GL_TRUE;
}
/**
* Allocate a new renderbuffer tpo describe the user-provided color buffer.
*/
static struct gl_renderbuffer *
new_osmesa_renderbuffer(GLenum format)
{
struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
if (rb) {
const GLuint name = 0;
_mesa_init_renderbuffer(rb, name);
rb->Delete = osmesa_delete_renderbuffer;
rb->AllocStorage = osmesa_renderbuffer_storage;
if (format == OSMESA_COLOR_INDEX) {
rb->_BaseFormat = GL_COLOR_INDEX;
rb->InternalFormat = GL_COLOR_INDEX;
rb->DataType = GL_UNSIGNED_BYTE;
}
else {
rb->_BaseFormat = GL_RGBA;
rb->InternalFormat = GL_RGBA;
rb->DataType = CHAN_TYPE;
}
}
return rb;
}
/**********************************************************************/
/***** Public Functions *****/
/**********************************************************************/
/*
* Create an Off-Screen Mesa rendering context. The only attribute needed is
* an RGBA vs Color-Index mode flag.
*
* Input: format - either GL_RGBA or GL_COLOR_INDEX
* sharelist - specifies another OSMesaContext with which to share
* display lists. NULL indicates no sharing.
* Return: an OSMesaContext or 0 if error
*/
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContext( GLenum format, OSMesaContext sharelist )
{
const GLint accumBits = (format == OSMESA_COLOR_INDEX) ? 0 : 16;
return OSMesaCreateContextExt(format, DEFAULT_SOFTWARE_DEPTH_BITS,
8, accumBits, sharelist);
}
/*
* New in Mesa 3.5
*
* Create context and specify size of ancillary buffers.
*/
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
GLint accumBits, OSMesaContext sharelist )
{
OSMesaContext osmesa;
struct dd_function_table functions;
GLint rshift, gshift, bshift, ashift;
GLint rind, gind, bind, aind;
GLint indexBits = 0, redBits = 0, greenBits = 0, blueBits = 0, alphaBits =0;
GLboolean rgbmode;
const GLuint i4 = 1;
const GLubyte *i1 = (GLubyte *) &i4;
const GLint little_endian = *i1;
rind = gind = bind = aind = 0;
if (format==OSMESA_COLOR_INDEX) {
indexBits = 8;
rshift = gshift = bshift = ashift = 0;
rgbmode = GL_FALSE;
}
else if (format==OSMESA_RGBA) {
indexBits = 0;
redBits = CHAN_BITS;
greenBits = CHAN_BITS;
blueBits = CHAN_BITS;
alphaBits = CHAN_BITS;
rind = 0;
gind = 1;
bind = 2;
aind = 3;
if (little_endian) {
rshift = 0;
gshift = 8;
bshift = 16;
ashift = 24;
}
else {
rshift = 24;
gshift = 16;
bshift = 8;
ashift = 0;
}
rgbmode = GL_TRUE;
}
else if (format==OSMESA_BGRA) {
indexBits = 0;
redBits = CHAN_BITS;
greenBits = CHAN_BITS;
blueBits = CHAN_BITS;
alphaBits = CHAN_BITS;
bind = 0;
gind = 1;
rind = 2;
aind = 3;
if (little_endian) {
bshift = 0;
gshift = 8;
rshift = 16;
ashift = 24;
}
else {
bshift = 24;
gshift = 16;
rshift = 8;
ashift = 0;
}
rgbmode = GL_TRUE;
}
else if (format==OSMESA_ARGB) {
indexBits = 0;
redBits = CHAN_BITS;
greenBits = CHAN_BITS;
blueBits = CHAN_BITS;
alphaBits = CHAN_BITS;
aind = 0;
rind = 1;
gind = 2;
bind = 3;
if (little_endian) {
ashift = 0;
rshift = 8;
gshift = 16;
bshift = 24;
}
else {
ashift = 24;
rshift = 16;
gshift = 8;
bshift = 0;
}
rgbmode = GL_TRUE;
}
else if (format==OSMESA_RGB) {
indexBits = 0;
redBits = CHAN_BITS;
greenBits = CHAN_BITS;
blueBits = CHAN_BITS;
alphaBits = 0;
bshift = 0;
gshift = 8;
rshift = 16;
ashift = 24;
rind = 0;
gind = 1;
bind = 2;
rgbmode = GL_TRUE;
}
else if (format==OSMESA_BGR) {
indexBits = 0;
redBits = CHAN_BITS;
greenBits = CHAN_BITS;
blueBits = CHAN_BITS;
alphaBits = 0;
bshift = 0;
gshift = 8;
rshift = 16;
ashift = 24;
rind = 2;
gind = 1;
bind = 0;
rgbmode = GL_TRUE;
}
#if CHAN_TYPE == GL_UNSIGNED_BYTE
else if (format==OSMESA_RGB_565) {
indexBits = 0;
redBits = 5;
greenBits = 6;
blueBits = 5;
alphaBits = 0;
rshift = 11;
gshift = 5;
bshift = 0;
ashift = 0;
rind = 0; /* not used */
gind = 0;
bind = 0;
rgbmode = GL_TRUE;
}
#endif
else {
return NULL;
}
osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context);
if (osmesa) {
osmesa->gl_visual = _mesa_create_visual( rgbmode,
GL_FALSE, /* double buffer */
GL_FALSE, /* stereo */
redBits,
greenBits,
blueBits,
alphaBits,
indexBits,
depthBits,
stencilBits,
accumBits,
accumBits,
accumBits,
alphaBits ? accumBits : 0,
1 /* num samples */
);
if (!osmesa->gl_visual) {
FREE(osmesa);
return NULL;
}
/* Initialize device driver function table */
_mesa_init_driver_functions(&functions);
/* override with our functions */
functions.GetString = get_string;
functions.UpdateState = osmesa_update_state;
functions.GetBufferSize = get_buffer_size;
if (!_mesa_initialize_context(&osmesa->mesa,
osmesa->gl_visual,
sharelist ? &sharelist->mesa
: (GLcontext *) NULL,
&functions, (void *) osmesa)) {
_mesa_destroy_visual( osmesa->gl_visual );
FREE(osmesa);
return NULL;
}
_mesa_enable_sw_extensions(&(osmesa->mesa));
_mesa_enable_1_3_extensions(&(osmesa->mesa));
_mesa_enable_1_4_extensions(&(osmesa->mesa));
_mesa_enable_1_5_extensions(&(osmesa->mesa));
osmesa->gl_buffer = _mesa_create_framebuffer(osmesa->gl_visual);
if (!osmesa->gl_buffer) {
_mesa_destroy_visual( osmesa->gl_visual );
_mesa_free_context_data( &osmesa->mesa );
FREE(osmesa);
return NULL;
}
_mesa_add_renderbuffer(osmesa->gl_buffer, BUFFER_FRONT_LEFT,
new_osmesa_renderbuffer(format));
_mesa_add_soft_renderbuffers(osmesa->gl_buffer,
GL_FALSE, /* color */
osmesa->gl_visual->haveDepthBuffer,
osmesa->gl_visual->haveStencilBuffer,
osmesa->gl_visual->haveAccumBuffer,
GL_FALSE, /* alpha */
GL_FALSE /* aux */ );
osmesa->format = format;
osmesa->buffer = NULL;
osmesa->width = 0;
osmesa->height = 0;
osmesa->userRowLength = 0;
osmesa->rowlength = 0;
osmesa->yup = GL_TRUE;
osmesa->rshift = rshift;
osmesa->gshift = gshift;
osmesa->bshift = bshift;
osmesa->ashift = ashift;
osmesa->rInd = rind;
osmesa->gInd = gind;
osmesa->bInd = bind;
osmesa->aInd = aind;
/* Initialize the software rasterizer and helper modules. */
{
GLcontext *ctx = &osmesa->mesa;
SWcontext *swrast;
struct swrast_device_driver *swdd;
TNLcontext *tnl;
if (!_swrast_CreateContext( ctx ) ||
!_ac_CreateContext( ctx ) ||
!_tnl_CreateContext( ctx ) ||
!_swsetup_CreateContext( ctx )) {
_mesa_destroy_visual(osmesa->gl_visual);
_mesa_free_context_data(ctx);
_mesa_free(osmesa);
return NULL;
}
_swsetup_Wakeup( ctx );
/* use default TCL pipeline */
tnl = TNL_CONTEXT(ctx);
tnl->Driver.RunPipeline = _tnl_run_pipeline;
swdd = _swrast_GetDeviceDriverReference( ctx );
swdd->SetBuffer = set_buffer;
/* no longer used */
swdd->WriteRGBASpan = NULL;
swdd->WriteRGBSpan = NULL;
swdd->WriteMonoRGBASpan = NULL;
swdd->WriteRGBAPixels = NULL;
swdd->WriteMonoRGBAPixels = NULL;
swdd->ReadRGBASpan = NULL;
swdd->ReadRGBAPixels = NULL;
/* Extend the software rasterizer with our optimized line and triangle
* drawing functions.
*/
swrast = SWRAST_CONTEXT( ctx );
swrast->choose_line = osmesa_choose_line;
swrast->choose_triangle = osmesa_choose_triangle;
swrast->invalidate_line |= OSMESA_NEW_LINE;
swrast->invalidate_triangle |= OSMESA_NEW_TRIANGLE;
}
}
return osmesa;
}
/*
* Destroy an Off-Screen Mesa rendering context.
*
* Input: ctx - the context to destroy
*/
GLAPI void GLAPIENTRY
OSMesaDestroyContext( OSMesaContext ctx )
{
if (ctx) {
_swsetup_DestroyContext( &ctx->mesa );
_tnl_DestroyContext( &ctx->mesa );
_ac_DestroyContext( &ctx->mesa );
_swrast_DestroyContext( &ctx->mesa );
_mesa_destroy_visual( ctx->gl_visual );
_mesa_destroy_framebuffer( ctx->gl_buffer );
_mesa_free_context_data( &ctx->mesa );
FREE( ctx );
}
}
/*
* Recompute the values of the context's rowaddr array.
*/
static void
compute_row_addresses( OSMesaContext ctx )
{
GLint bytesPerPixel, bytesPerRow, i;
GLubyte *origin = (GLubyte *) ctx->buffer;
if (ctx->format == OSMESA_COLOR_INDEX) {
/* CI mode */
bytesPerPixel = 1 * sizeof(GLchan);
}
else if ((ctx->format == OSMESA_RGB) || (ctx->format == OSMESA_BGR)) {
/* RGB mode */
bytesPerPixel = 3 * sizeof(GLchan);
}
else if (ctx->format == OSMESA_RGB_565) {
/* 5/6/5 RGB pixel in 16 bits */
bytesPerPixel = 2;
}
else {
/* RGBA mode */
bytesPerPixel = 4 * sizeof(GLchan);
}
bytesPerRow = ctx->rowlength * bytesPerPixel;
if (ctx->yup) {
/* Y=0 is bottom line of window */
for (i = 0; i < MAX_HEIGHT; i++) {
ctx->rowaddr[i] = (GLchan *) ((GLubyte *) origin + i * bytesPerRow);
}
}
else {
/* Y=0 is top line of window */
for (i = 0; i < MAX_HEIGHT; i++) {
GLint j = ctx->height - i - 1;
ctx->rowaddr[i] = (GLchan *) ((GLubyte *) origin + j * bytesPerRow);
}
}
}
/*
* Bind an OSMesaContext to an image buffer. The image buffer is just a
* block of memory which the client provides. Its size must be at least
* as large as width*height*sizeof(type). Its address should be a multiple
* of 4 if using RGBA mode.
*
* Image data is stored in the order of glDrawPixels: row-major order
* with the lower-left image pixel stored in the first array position
* (ie. bottom-to-top).
*
* If the context's viewport hasn't been initialized yet, it will now be
* initialized to (0,0,width,height).
*
* Input: ctx - the rendering context
* buffer - the image buffer memory
* type - data type for pixel components
* Normally, only GL_UNSIGNED_BYTE and GL_UNSIGNED_SHORT_5_6_5
* are supported. But if Mesa's been compiled with CHAN_BITS==16
* then type must be GL_UNSIGNED_SHORT. And if Mesa's been build
* with CHAN_BITS==32 then type must be GL_FLOAT.
* width, height - size of image buffer in pixels, at least 1
* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
* invalid buffer address, invalid type, width<1, height<1,
* width>internal limit or height>internal limit.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
GLsizei width, GLsizei height )
{
if (!ctx || !buffer ||
width < 1 || height < 1 ||
width > MAX_WIDTH || height > MAX_HEIGHT) {
return GL_FALSE;
}
if (ctx->format == OSMESA_RGB_565) {
if (type != GL_UNSIGNED_SHORT_5_6_5)
return GL_FALSE;
}
else if (type != CHAN_TYPE) {
return GL_FALSE;
}
/* Need to set these before calling _mesa_make_current() since the first
* time the context is bound, _mesa_make_current() will call our
* get_buffer_size() function to initialize the viewport. These are the
* values returned by get_buffer_size():
*/
ctx->buffer = buffer;
ctx->width = width;
ctx->height = height;
osmesa_update_state( &ctx->mesa, 0 );
_mesa_make_current( &ctx->mesa, ctx->gl_buffer, ctx->gl_buffer );
if (ctx->userRowLength)
ctx->rowlength = ctx->userRowLength;
else
ctx->rowlength = width;
compute_row_addresses( ctx );
/* this will make ensure we recognize the new buffer size */
_mesa_resize_framebuffer(&ctx->mesa, ctx->gl_buffer, width, height);
#if 00
_mesa_ResizeBuffersMESA();
#endif
/* Added by Gerk Huisma: */
_tnl_MakeCurrent( &ctx->mesa, ctx->mesa.DrawBuffer,
ctx->mesa.ReadBuffer );
return GL_TRUE;
}
GLAPI OSMesaContext GLAPIENTRY
OSMesaGetCurrentContext( void )
{
GLcontext *ctx = _mesa_get_current_context();
if (ctx)
return (OSMesaContext) ctx;
else
return NULL;
}
GLAPI void GLAPIENTRY
OSMesaPixelStore( GLint pname, GLint value )
{
OSMesaContext osmesa = OSMesaGetCurrentContext();
switch (pname) {
case OSMESA_ROW_LENGTH:
if (value<0) {
_mesa_error( &osmesa->mesa, GL_INVALID_VALUE,
"OSMesaPixelStore(value)" );
return;
}
osmesa->userRowLength = value;
osmesa->rowlength = value ? value : osmesa->width;
break;
case OSMESA_Y_UP:
osmesa->yup = value ? GL_TRUE : GL_FALSE;
break;
default:
_mesa_error( &osmesa->mesa, GL_INVALID_ENUM, "OSMesaPixelStore(pname)" );
return;
}
compute_row_addresses( osmesa );
}
GLAPI void GLAPIENTRY
OSMesaGetIntegerv( GLint pname, GLint *value )
{
OSMesaContext osmesa = OSMesaGetCurrentContext();
switch (pname) {
case OSMESA_WIDTH:
*value = osmesa->width;
return;
case OSMESA_HEIGHT:
*value = osmesa->height;
return;
case OSMESA_FORMAT:
*value = osmesa->format;
return;
case OSMESA_TYPE:
*value = CHAN_TYPE;
return;
case OSMESA_ROW_LENGTH:
*value = osmesa->userRowLength;
return;
case OSMESA_Y_UP:
*value = osmesa->yup;
return;
case OSMESA_MAX_WIDTH:
*value = MAX_WIDTH;
return;
case OSMESA_MAX_HEIGHT:
*value = MAX_HEIGHT;
return;
default:
_mesa_error(&osmesa->mesa, GL_INVALID_ENUM, "OSMesaGetIntergerv(pname)");
return;
}
}
/*
* Return the depth buffer associated with an OSMesa context.
* Input: c - the OSMesa context
* Output: width, height - size of buffer in pixels
* bytesPerValue - bytes per depth value (2 or 4)
* buffer - pointer to depth buffer values
* Return: GL_TRUE or GL_FALSE to indicate success or failure.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaGetDepthBuffer( OSMesaContext c, GLint *width, GLint *height,
GLint *bytesPerValue, void **buffer )
{
struct gl_renderbuffer *rb = NULL;
if (c->gl_buffer)
rb = c->gl_buffer->Attachment[BUFFER_DEPTH].Renderbuffer;
if (!rb || !rb->Data) {
/*if ((!c->gl_buffer) || (!c->gl_buffer->DepthBuffer)) {*/
*width = 0;
*height = 0;
*bytesPerValue = 0;
*buffer = 0;
return GL_FALSE;
}
else {
*width = c->gl_buffer->Width;
*height = c->gl_buffer->Height;
if (c->gl_visual->depthBits <= 16)
*bytesPerValue = sizeof(GLushort);
else
*bytesPerValue = sizeof(GLuint);
*buffer = rb->Data;
return GL_TRUE;
}
}
/*
* Return the color buffer associated with an OSMesa context.
* Input: c - the OSMesa context
* Output: width, height - size of buffer in pixels
* format - the pixel format (OSMESA_FORMAT)
* buffer - pointer to color buffer values
* Return: GL_TRUE or GL_FALSE to indicate success or failure.
*/
GLAPI GLboolean GLAPIENTRY
OSMesaGetColorBuffer( OSMesaContext c, GLint *width,
GLint *height, GLint *format, void **buffer )
{
if (!c->buffer) {
*width = 0;
*height = 0;
*format = 0;
*buffer = 0;
return GL_FALSE;
}
else {
*width = c->width;
*height = c->height;
*format = c->format;
*buffer = c->buffer;
return GL_TRUE;
}
}
struct name_function
{
const char *Name;
OSMESAproc Function;
};
static struct name_function functions[] = {
{ "OSMesaCreateContext", (OSMESAproc) OSMesaCreateContext },
{ "OSMesaCreateContextExt", (OSMESAproc) OSMesaCreateContextExt },
{ "OSMesaDestroyContext", (OSMESAproc) OSMesaDestroyContext },
{ "OSMesaMakeCurrent", (OSMESAproc) OSMesaMakeCurrent },
{ "OSMesaGetCurrentContext", (OSMESAproc) OSMesaGetCurrentContext },
{ "OSMesaPixelsStore", (OSMESAproc) OSMesaPixelStore },
{ "OSMesaGetIntegerv", (OSMESAproc) OSMesaGetIntegerv },
{ "OSMesaGetDepthBuffer", (OSMESAproc) OSMesaGetDepthBuffer },
{ "OSMesaGetColorBuffer", (OSMESAproc) OSMesaGetColorBuffer },
{ "OSMesaGetProcAddress", (OSMESAproc) OSMesaGetProcAddress },
{ NULL, NULL }
};
GLAPI OSMESAproc GLAPIENTRY
OSMesaGetProcAddress( const char *funcName )
{
int i;
for (i = 0; functions[i].Name; i++) {
if (_mesa_strcmp(functions[i].Name, funcName) == 0)
return functions[i].Function;
}
return _glapi_get_proc_address(funcName);
}
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