src/mesa/state_tracker/st_cb_drawtex.c - platform/external/mesa3d - Git at Google

 /**************************************************************************
  *
  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
  * All Rights Reserved.
  *
  **************************************************************************/


 /**
  * Implementation of glDrawTex() for GL_OES_draw_tex
  */


 #include "main/imports.h"
 #include "main/image.h"
 #include "main/macros.h"
 #include "main/mfeatures.h"
 #include "program/program.h"
 #include "program/prog_print.h"

 #include "st_context.h"
 #include "st_atom.h"
 #include "st_cb_drawtex.h"

 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 #include "util/u_inlines.h"
 #include "pipe/p_shader_tokens.h"
 #include "util/u_draw_quad.h"
 #include "util/u_simple_shaders.h"
 #include "util/u_upload_mgr.h"

 #include "cso_cache/cso_context.h"


 #if FEATURE_OES_draw_texture


 struct cached_shader
 {
    void *handle;

    uint num_attribs;
    uint semantic_names[2 + MAX_TEXTURE_UNITS];
    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
 };

 #define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)

 /**
  * Simple linear list cache.
  * Most of the time there'll only be one cached shader.
  */
 static struct cached_shader CachedShaders[MAX_SHADERS];
 static GLuint NumCachedShaders = 0;


 static void *
 lookup_shader(struct pipe_context *pipe,
               uint num_attribs,
               const uint *semantic_names,
               const uint *semantic_indexes)
 {
    GLuint i, j;

    /* look for existing shader with same attributes */
    for (i = 0; i < NumCachedShaders; i++) {
       if (CachedShaders[i].num_attribs == num_attribs) {
          GLboolean match = GL_TRUE;
          for (j = 0; j < num_attribs; j++) {
             if (semantic_names[j] != CachedShaders[i].semantic_names[j] ||
                 semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
                match = GL_FALSE;
                break;
             }
          }
          if (match)
             return CachedShaders[i].handle;
       }
    }

    /* not found - create new one now */
    if (NumCachedShaders >= MAX_SHADERS) {
       return NULL;
    }

    CachedShaders[i].num_attribs = num_attribs;
    for (j = 0; j < num_attribs; j++) {
       CachedShaders[i].semantic_names[j] = semantic_names[j];
       CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
    }

    CachedShaders[i].handle =
       util_make_vertex_passthrough_shader(pipe,
                                           num_attribs,
                                           semantic_names,
                                           semantic_indexes);
    NumCachedShaders++;

    return CachedShaders[i].handle;
 }

 static void
 st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
            GLfloat width, GLfloat height)
 {
    struct st_context *st = ctx->st;
    struct pipe_context *pipe = st->pipe;
    struct cso_context *cso = ctx->st->cso_context;
    struct pipe_resource *vbuffer = NULL;
    GLuint i, numTexCoords, numAttribs;
    GLboolean emitColor;
    uint semantic_names[2 + MAX_TEXTURE_UNITS];
    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
    struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
    unsigned offset;

    st_validate_state(st);

    /* determine if we need vertex color */
    if (ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL0)
       emitColor = GL_TRUE;
    else
       emitColor = GL_FALSE;

    /* determine how many enabled sets of texcoords */
    numTexCoords = 0;
    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
       if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
          numTexCoords++;
       }
    }

    /* total number of attributes per vertex */
    numAttribs = 1 + emitColor + numTexCoords;

    /* load vertex buffer */
    {
 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W)                              \
       do {                                                              \
          GLuint k = (((VERT) * numAttribs + (ATTR)) * 4);               \
          assert(k < 4 * 4 * numAttribs);                                \
          vbuf[k + 0] = X;                                               \
          vbuf[k + 1] = Y;                                               \
          vbuf[k + 2] = Z;                                               \
          vbuf[k + 3] = W;                                               \
       } while (0)

       const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
       GLfloat *vbuf = NULL;
       GLuint attr;

       if (u_upload_alloc(st->uploader, 0,
                          numAttribs * 4 * 4 * sizeof(GLfloat),
                          &offset, &vbuffer, (void **) &vbuf) != PIPE_OK) {
          return;
       }

       z = CLAMP(z, 0.0f, 1.0f);

       /* positions (in clip coords) */
       {
          const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
          const GLfloat fb_width = (GLfloat)fb->Width;
          const GLfloat fb_height = (GLfloat)fb->Height;

          const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
          const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
          const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
          const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);

          SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f);   /* lower left */
          SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f);   /* lower right */
          SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f);   /* upper right */
          SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f);   /* upper left */

          semantic_names[0] = TGSI_SEMANTIC_POSITION;
          semantic_indexes[0] = 0;
       }

       /* colors */
       if (emitColor) {
          const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
          SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
          SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
          SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
          SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
          semantic_names[1] = TGSI_SEMANTIC_COLOR;
          semantic_indexes[1] = 0;
          attr = 2;
       }
       else {
          attr = 1;
       }

       /* texcoords */
       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
          if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
             struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
             struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
             const GLfloat wt = (GLfloat) img->Width;
             const GLfloat ht = (GLfloat) img->Height;
             const GLfloat s0 = obj->CropRect[0] / wt;
             const GLfloat t0 = obj->CropRect[1] / ht;
             const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
             const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;

             /*printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);*/
             SET_ATTRIB(0, attr, s0, t0, 0.0f, 1.0f);  /* lower left */
             SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f);  /* lower right */
             SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f);  /* upper right */
             SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f);  /* upper left */

             semantic_names[attr] = TGSI_SEMANTIC_GENERIC;
             semantic_indexes[attr] = 0;

             attr++;
          }
       }

       u_upload_unmap(st->uploader);

 #undef SET_ATTRIB
    }


    cso_save_viewport(cso);
    cso_save_stream_outputs(cso);
    cso_save_vertex_shader(cso);
    cso_save_geometry_shader(cso);
    cso_save_vertex_elements(cso);
    cso_save_vertex_buffers(cso);

    {
       void *vs = lookup_shader(pipe, numAttribs,
                                semantic_names, semantic_indexes);
       cso_set_vertex_shader_handle(cso, vs);
    }
    cso_set_geometry_shader_handle(cso, NULL);

    for (i = 0; i < numAttribs; i++) {
       velements[i].src_offset = i * 4 * sizeof(float);
       velements[i].instance_divisor = 0;
       velements[i].vertex_buffer_index = 0;
       velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
    }
    cso_set_vertex_elements(cso, numAttribs, velements);
    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);

    /* viewport state: viewport matching window dims */
    {
       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
       const GLfloat width = (GLfloat)fb->Width;
       const GLfloat height = (GLfloat)fb->Height;
       struct pipe_viewport_state vp;
       vp.scale[0] =  0.5f * width;
       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
       vp.scale[2] = 1.0f;
       vp.scale[3] = 1.0f;
       vp.translate[0] = 0.5f * width;
       vp.translate[1] = 0.5f * height;
       vp.translate[2] = 0.0f;
       vp.translate[3] = 0.0f;
       cso_set_viewport(cso, &vp);
    }


    util_draw_vertex_buffer(pipe, cso, vbuffer,
                            offset,  /* offset */
                            PIPE_PRIM_TRIANGLE_FAN,
                            4,  /* verts */
                            numAttribs); /* attribs/vert */


    pipe_resource_reference(&vbuffer, NULL);

    /* restore state */
    cso_restore_viewport(cso);
    cso_restore_vertex_shader(cso);
    cso_restore_geometry_shader(cso);
    cso_restore_vertex_elements(cso);
    cso_restore_vertex_buffers(cso);
    cso_restore_stream_outputs(cso);
 }


 void
 st_init_drawtex_functions(struct dd_function_table *functions)
 {
    functions->DrawTex = st_DrawTex;
 }


 /**
  * Free any cached shaders
  */
 void
 st_destroy_drawtex(struct st_context *st)
 {
    GLuint i;
    for (i = 0; i < NumCachedShaders; i++) {
       cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
    }
    NumCachedShaders = 0;
 }


 #endif /* FEATURE_OES_draw_texture */
	/**************************************************************************
	*
	* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
	* All Rights Reserved.
	*
	**************************************************************************/


	/**
	* Implementation of glDrawTex() for GL_OES_draw_tex
	*/



	#include "main/imports.h"
	#include "main/image.h"
	#include "main/macros.h"
	#include "main/mfeatures.h"
	#include "program/program.h"
	#include "program/prog_print.h"

	#include "st_context.h"
	#include "st_atom.h"
	#include "st_cb_drawtex.h"

	#include "pipe/p_context.h"
	#include "pipe/p_defines.h"
	#include "util/u_inlines.h"
	#include "pipe/p_shader_tokens.h"
	#include "util/u_draw_quad.h"
	#include "util/u_simple_shaders.h"
	#include "util/u_upload_mgr.h"

	#include "cso_cache/cso_context.h"


	#if FEATURE_OES_draw_texture


	struct cached_shader
	{
	void *handle;

	uint num_attribs;
	uint semantic_names[2 + MAX_TEXTURE_UNITS];
	uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
	};

	#define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)

	/**
	* Simple linear list cache.
	* Most of the time there'll only be one cached shader.
	*/
	static struct cached_shader CachedShaders[MAX_SHADERS];
	static GLuint NumCachedShaders = 0;


	static void *
	lookup_shader(struct pipe_context *pipe,
	uint num_attribs,
	const uint *semantic_names,
	const uint *semantic_indexes)
	{
	GLuint i, j;

	/* look for existing shader with same attributes */
	for (i = 0; i < NumCachedShaders; i++) {
	if (CachedShaders[i].num_attribs == num_attribs) {
	GLboolean match = GL_TRUE;
	for (j = 0; j < num_attribs; j++) {
	if (semantic_names[j] != CachedShaders[i].semantic_names[j] \|\|
	semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
	match = GL_FALSE;
	break;
	}
	}
	if (match)
	return CachedShaders[i].handle;
	}
	}

	/* not found - create new one now */
	if (NumCachedShaders >= MAX_SHADERS) {
	return NULL;
	}

	CachedShaders[i].num_attribs = num_attribs;
	for (j = 0; j < num_attribs; j++) {
	CachedShaders[i].semantic_names[j] = semantic_names[j];
	CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
	}

	CachedShaders[i].handle =
	util_make_vertex_passthrough_shader(pipe,
	num_attribs,
	semantic_names,
	semantic_indexes);
	NumCachedShaders++;

	return CachedShaders[i].handle;
	}

	static void
	st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
	GLfloat width, GLfloat height)
	{
	struct st_context *st = ctx->st;
	struct pipe_context *pipe = st->pipe;
	struct cso_context *cso = ctx->st->cso_context;
	struct pipe_resource *vbuffer = NULL;
	GLuint i, numTexCoords, numAttribs;
	GLboolean emitColor;
	uint semantic_names[2 + MAX_TEXTURE_UNITS];
	uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
	struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
	unsigned offset;

	st_validate_state(st);

	/* determine if we need vertex color */
	if (ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL0)
	emitColor = GL_TRUE;
	else
	emitColor = GL_FALSE;

	/* determine how many enabled sets of texcoords */
	numTexCoords = 0;
	for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
	if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
	numTexCoords++;
	}
	}

	/* total number of attributes per vertex */
	numAttribs = 1 + emitColor + numTexCoords;

	/* load vertex buffer */
	{
	#define SET_ATTRIB(VERT, ATTR, X, Y, Z, W) \
	do { \
	GLuint k = (((VERT) * numAttribs + (ATTR)) * 4); \
	assert(k < 4 * 4 * numAttribs); \
	vbuf[k + 0] = X; \
	vbuf[k + 1] = Y; \
	vbuf[k + 2] = Z; \
	vbuf[k + 3] = W; \
	} while (0)

	const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
	GLfloat *vbuf = NULL;
	GLuint attr;

	if (u_upload_alloc(st->uploader, 0,
	numAttribs * 4 * 4 * sizeof(GLfloat),
	&offset, &vbuffer, (void **) &vbuf) != PIPE_OK) {
	return;
	}

	z = CLAMP(z, 0.0f, 1.0f);

	/* positions (in clip coords) */
	{
	const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
	const GLfloat fb_width = (GLfloat)fb->Width;
	const GLfloat fb_height = (GLfloat)fb->Height;

	const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
	const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
	const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
	const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);

	SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f); /* lower left */
	SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f); /* lower right */
	SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f); /* upper right */
	SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f); /* upper left */

	semantic_names[0] = TGSI_SEMANTIC_POSITION;
	semantic_indexes[0] = 0;
	}

	/* colors */
	if (emitColor) {
	const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
	SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
	SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
	SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
	SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
	semantic_names[1] = TGSI_SEMANTIC_COLOR;
	semantic_indexes[1] = 0;
	attr = 2;
	}
	else {
	attr = 1;
	}

	/* texcoords */
	for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
	if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
	struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
	struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
	const GLfloat wt = (GLfloat) img->Width;
	const GLfloat ht = (GLfloat) img->Height;
	const GLfloat s0 = obj->CropRect[0] / wt;
	const GLfloat t0 = obj->CropRect[1] / ht;
	const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
	const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;

	/printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);/
	SET_ATTRIB(0, attr, s0, t0, 0.0f, 1.0f); /* lower left */
	SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f); /* lower right */
	SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f); /* upper right */
	SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f); /* upper left */

	semantic_names[attr] = TGSI_SEMANTIC_GENERIC;
	semantic_indexes[attr] = 0;

	attr++;
	}
	}

	u_upload_unmap(st->uploader);

	#undef SET_ATTRIB
	}


	cso_save_viewport(cso);
	cso_save_stream_outputs(cso);
	cso_save_vertex_shader(cso);
	cso_save_geometry_shader(cso);
	cso_save_vertex_elements(cso);
	cso_save_vertex_buffers(cso);

	{
	void *vs = lookup_shader(pipe, numAttribs,
	semantic_names, semantic_indexes);
	cso_set_vertex_shader_handle(cso, vs);
	}
	cso_set_geometry_shader_handle(cso, NULL);

	for (i = 0; i < numAttribs; i++) {
	velements[i].src_offset = i * 4 * sizeof(float);
	velements[i].instance_divisor = 0;
	velements[i].vertex_buffer_index = 0;
	velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
	}
	cso_set_vertex_elements(cso, numAttribs, velements);
	cso_set_stream_outputs(st->cso_context, 0, NULL, 0);

	/* viewport state: viewport matching window dims */
	{
	const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
	const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
	const GLfloat width = (GLfloat)fb->Width;
	const GLfloat height = (GLfloat)fb->Height;
	struct pipe_viewport_state vp;
	vp.scale[0] = 0.5f * width;
	vp.scale[1] = height * (invert ? -0.5f : 0.5f);
	vp.scale[2] = 1.0f;
	vp.scale[3] = 1.0f;
	vp.translate[0] = 0.5f * width;
	vp.translate[1] = 0.5f * height;
	vp.translate[2] = 0.0f;
	vp.translate[3] = 0.0f;
	cso_set_viewport(cso, &vp);
	}


	util_draw_vertex_buffer(pipe, cso, vbuffer,
	offset, /* offset */
	PIPE_PRIM_TRIANGLE_FAN,
	4, /* verts */
	numAttribs); /* attribs/vert */


	pipe_resource_reference(&vbuffer, NULL);

	/* restore state */
	cso_restore_viewport(cso);
	cso_restore_vertex_shader(cso);
	cso_restore_geometry_shader(cso);
	cso_restore_vertex_elements(cso);
	cso_restore_vertex_buffers(cso);
	cso_restore_stream_outputs(cso);
	}


	void
	st_init_drawtex_functions(struct dd_function_table *functions)
	{
	functions->DrawTex = st_DrawTex;
	}


	/**
	* Free any cached shaders
	*/
	void
	st_destroy_drawtex(struct st_context *st)
	{
	GLuint i;
	for (i = 0; i < NumCachedShaders; i++) {
	cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
	}
	NumCachedShaders = 0;
	}


	#endif /* FEATURE_OES_draw_texture */