From: Chia-I Wu <o...@lunarg.com>
It can be used for dd->DrawTex.
---
src/mesa/drivers/common/meta.c | 141 ++++++++++++++++++++++++++++++++++++++++
src/mesa/drivers/common/meta.h | 3 +
2 files changed, 144 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 291d912..c772543 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -259,6 +259,17 @@ struct gen_mipmap_state
GLuint FBO;
};
+
+/**
+ * State for glDrawTex()
+ */
+struct drawtex_state
+{
+ GLuint ArrayObj;
+ GLuint VBO;
+};
+
+
#define MAX_META_OPS_DEPTH 2
/**
* All per-context meta state.
@@ -278,6 +289,7 @@ struct gl_meta_state
struct drawpix_state DrawPix; /**< For _mesa_meta_DrawPixels() */
struct bitmap_state Bitmap; /**< For _mesa_meta_Bitmap() */
struct gen_mipmap_state Mipmap; /**< For _mesa_meta_GenerateMipmap() */
+ struct drawtex_state DrawTex; /**< For _mesa_meta_DrawTex() */
};
@@ -2994,3 +3006,132 @@ _mesa_meta_CopyColorSubTable(struct gl_context
*ctx,GLenum target, GLsizei start
free(buf);
}
+
+
+/**
+ * Meta implementation of ctx->Driver.DrawTex() in terms
+ * of polygon rendering.
+ */
+void
+_mesa_meta_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
+ GLfloat width, GLfloat height)
+{
+#if FEATURE_OES_draw_texture
+ struct drawtex_state *drawtex = &ctx->Meta->DrawTex;
+ struct vertex {
+ GLfloat x, y, z, st[MAX_TEXTURE_UNITS][2];
+ };
+ struct vertex verts[4];
+ GLuint i;
+
+ _mesa_meta_begin(ctx, (MESA_META_RASTERIZATION |
+ MESA_META_SHADER |
+ MESA_META_TRANSFORM |
+ MESA_META_VERTEX |
+ MESA_META_VIEWPORT));
+
+ if (drawtex->ArrayObj == 0) {
+ /* one-time setup */
+ GLint active_texture;
+
+ /* create vertex array object */
+ _mesa_GenVertexArrays(1, &drawtex->ArrayObj);
+ _mesa_BindVertexArray(drawtex->ArrayObj);
+
+ /* create vertex array buffer */
+ _mesa_GenBuffersARB(1, &drawtex->VBO);
+ _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, drawtex->VBO);
+ _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts),
+ NULL, GL_DYNAMIC_DRAW_ARB);
+
+ /* client active texture is not part of the array object */
+ active_texture = ctx->Array.ActiveTexture;
+
+ /* setup vertex arrays */
+ _mesa_VertexPointer(3, GL_FLOAT, sizeof(struct vertex), OFFSET(x));
+ _mesa_EnableClientState(GL_VERTEX_ARRAY);
+ for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
+ _mesa_ClientActiveTextureARB(GL_TEXTURE0 + i);
+ _mesa_TexCoordPointer(2, GL_FLOAT, sizeof(struct vertex),
OFFSET(st[i]));
+ _mesa_EnableClientState(GL_TEXTURE_COORD_ARRAY);
+ }
+
+ /* restore client active texture */
+ _mesa_ClientActiveTextureARB(GL_TEXTURE0 + active_texture);
+ }
+ else {
+ _mesa_BindVertexArray(drawtex->ArrayObj);
+ _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, drawtex->VBO);
+ }
+
+ /* vertex positions, texcoords */
+ {
+ const GLfloat x1 = x + width;
+ const GLfloat y1 = y + height;
+
+ z = CLAMP(z, 0.0, 1.0);
+ z = invert_z(z);
+
+ verts[0].x = x;
+ verts[0].y = y;
+ verts[0].z = z;
+
+ verts[1].x = x1;
+ verts[1].y = y;
+ verts[1].z = z;
+
+ verts[2].x = x1;
+ verts[2].y = y1;
+ verts[2].z = z;
+
+ verts[3].x = x;
+ verts[3].y = y1;
+ verts[3].z = z;
+
+ for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
+ const struct gl_texture_object *texObj;
+ const struct gl_texture_image *texImage;
+ GLfloat s, t, s1, t1;
+ GLuint tw, th;
+
+ if (!ctx->Texture.Unit[i]._ReallyEnabled) {
+ GLuint j;
+ for (j = 0; j < 4; j++) {
+ verts[j].st[i][0] = 0.0f;
+ verts[j].st[i][1] = 0.0f;
+ }
+ continue;
+ }
+
+ texObj = ctx->Texture.Unit[i]._Current;
+ texImage = texObj->Image[0][texObj->BaseLevel];
+ tw = texImage->Width2;
+ th = texImage->Height2;
+
+ s = (GLfloat) texObj->CropRect[0] / tw;
+ t = (GLfloat) texObj->CropRect[1] / th;
+ s1 = (GLfloat) (texObj->CropRect[0] + texObj->CropRect[2]) / tw;
+ t1 = (GLfloat) (texObj->CropRect[1] + texObj->CropRect[3]) / th;
+
+ verts[0].st[i][0] = s;
+ verts[0].st[i][1] = t;
+
+ verts[1].st[i][0] = s1;
+ verts[1].st[i][1] = t;
+
+ verts[2].st[i][0] = s1;
+ verts[2].st[i][1] = t1;
+
+ verts[3].st[i][0] = s;
+ verts[3].st[i][1] = t1;
+ }
+
+ _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, sizeof(verts), verts);
+ }
+
+ _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4);
+
+ _mesa_meta_end(ctx);
+#else
+#endif /* FEATURE_OES_draw_texture */
+}
diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index ac20e37..b52687f 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -140,5 +140,8 @@ _mesa_meta_CopyConvolutionFilter2D(struct gl_context *ctx,
GLenum target,
GLenum internalFormat, GLint x, GLint y,
GLsizei width, GLsizei height);
+extern void
+_mesa_meta_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
+ GLfloat width, GLfloat height);
#endif /* META_H */
--
1.7.5.4
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