diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c index 0e58aeca3f5..887118b9417 100644 --- a/src/mesa/drivers/common/meta.c +++ b/src/mesa/drivers/common/meta.c @@ -62,6 +62,7 @@ #include "main/teximage.h" #include "main/texparam.h" #include "main/texstate.h" +#include "main/uniforms.h" #include "main/varray.h" #include "main/viewport.h" #include "program/program.h" @@ -235,6 +236,8 @@ struct clear_state { GLuint ArrayObj; GLuint VBO; + GLuint ShaderProg; + GLint ColorLocation; }; @@ -1589,10 +1592,165 @@ _mesa_meta_Clear(struct gl_context *ctx, GLbitfield buffers) _mesa_meta_end(ctx); } +static void +meta_glsl_clear_init(struct gl_context *ctx, struct clear_state *clear) +{ + const char *vs_source = + "attribute vec4 position;\n" + "void main()\n" + "{\n" + " gl_Position = position;\n" + "}\n"; + const char *fs_source = + "uniform vec4 color;\n" + "void main()\n" + "{\n" + " gl_FragColor = color;\n" + "}\n"; + GLuint vs, fs; + + if (clear->ArrayObj != 0) + return; + + /* create vertex array object */ + _mesa_GenVertexArrays(1, &clear->ArrayObj); + _mesa_BindVertexArray(clear->ArrayObj); + + /* create vertex array buffer */ + _mesa_GenBuffersARB(1, &clear->VBO); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, clear->VBO); + + /* setup vertex arrays */ + _mesa_VertexAttribPointerARB(0, 3, GL_FLOAT, GL_FALSE, 0, (void *)0); + _mesa_EnableVertexAttribArrayARB(0); + + vs = _mesa_CreateShaderObjectARB(GL_VERTEX_SHADER); + _mesa_ShaderSourceARB(vs, 1, &vs_source, NULL); + _mesa_CompileShaderARB(vs); + + fs = _mesa_CreateShaderObjectARB(GL_FRAGMENT_SHADER); + _mesa_ShaderSourceARB(fs, 1, &fs_source, NULL); + _mesa_CompileShaderARB(fs); + + clear->ShaderProg = _mesa_CreateProgramObjectARB(); + _mesa_AttachShader(clear->ShaderProg, fs); + _mesa_AttachShader(clear->ShaderProg, vs); + _mesa_BindAttribLocationARB(clear->ShaderProg, 0, "position"); + _mesa_LinkProgramARB(clear->ShaderProg); + + clear->ColorLocation = _mesa_GetUniformLocationARB(clear->ShaderProg, + "color"); +} + +/** + * Meta implementation of ctx->Driver.Clear() in terms of polygon rendering. + */ +void +_mesa_meta_glsl_Clear(struct gl_context *ctx, GLbitfield buffers) +{ + struct clear_state *clear = &ctx->Meta->Clear; + GLbitfield metaSave; + const GLuint stencilMax = (1 << ctx->DrawBuffer->Visual.stencilBits) - 1; + struct gl_framebuffer *fb = ctx->DrawBuffer; + const float x0 = ((float)fb->_Xmin / fb->Width) * 2.0f - 1.0f; + const float y0 = ((float)fb->_Ymin / fb->Height) * 2.0f - 1.0f; + const float x1 = ((float)fb->_Xmax / fb->Width) * 2.0f - 1.0f; + const float y1 = ((float)fb->_Ymax / fb->Height) * 2.0f - 1.0f; + const float z = -invert_z(ctx->Depth.Clear); + struct vertex { + GLfloat x, y, z; + } verts[4]; + + metaSave = (META_ALPHA_TEST | + META_BLEND | + META_DEPTH_TEST | + META_RASTERIZATION | + META_SHADER | + META_STENCIL_TEST | + META_VERTEX | + META_VIEWPORT | + META_CLAMP_FRAGMENT_COLOR); + + if (!(buffers & BUFFER_BITS_COLOR)) { + /* We'll use colormask to disable color writes. Otherwise, + * respect color mask + */ + metaSave |= META_COLOR_MASK; + } + + _mesa_meta_begin(ctx, metaSave); + + meta_glsl_clear_init(ctx, clear); + + _mesa_UseProgramObjectARB(clear->ShaderProg); + _mesa_Uniform4fvARB(clear->ColorLocation, 1, + ctx->Color.ClearColorUnclamped); + + _mesa_BindVertexArray(clear->ArrayObj); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, clear->VBO); + + /* GL_COLOR_BUFFER_BIT */ + if (buffers & BUFFER_BITS_COLOR) { + /* leave colormask, glDrawBuffer state as-is */ + + /* Clears never have the color clamped. */ + _mesa_ClampColorARB(GL_CLAMP_FRAGMENT_COLOR, GL_FALSE); + } + else { + ASSERT(metaSave & META_COLOR_MASK); + _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); + } + + /* GL_DEPTH_BUFFER_BIT */ + if (buffers & BUFFER_BIT_DEPTH) { + _mesa_set_enable(ctx, GL_DEPTH_TEST, GL_TRUE); + _mesa_DepthFunc(GL_ALWAYS); + _mesa_DepthMask(GL_TRUE); + } + else { + assert(!ctx->Depth.Test); + } + + /* GL_STENCIL_BUFFER_BIT */ + if (buffers & BUFFER_BIT_STENCIL) { + _mesa_set_enable(ctx, GL_STENCIL_TEST, GL_TRUE); + _mesa_StencilOpSeparate(GL_FRONT_AND_BACK, + GL_REPLACE, GL_REPLACE, GL_REPLACE); + _mesa_StencilFuncSeparate(GL_FRONT_AND_BACK, GL_ALWAYS, + ctx->Stencil.Clear & stencilMax, + ctx->Stencil.WriteMask[0]); + } + else { + assert(!ctx->Stencil.Enabled); + } + + /* vertex positions */ + verts[0].x = x0; + verts[0].y = y0; + verts[0].z = z; + verts[1].x = x1; + verts[1].y = y0; + verts[1].z = z; + verts[2].x = x1; + verts[2].y = y1; + verts[2].z = z; + verts[3].x = x0; + verts[3].y = y1; + verts[3].z = z; + + /* upload new vertex data */ + _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, + GL_DYNAMIC_DRAW_ARB); + + /* draw quad */ + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + _mesa_meta_end(ctx); +} /** * Meta implementation of ctx->Driver.CopyPixels() in terms - * of texture mapping and polygon rendering. + * of texture mapping and polygon rendering and GLSL shaders. */ void _mesa_meta_CopyPixels(struct gl_context *ctx, GLint srcX, GLint srcY, diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h index b0797d3d91a..32c789ea638 100644 --- a/src/mesa/drivers/common/meta.h +++ b/src/mesa/drivers/common/meta.h @@ -42,6 +42,9 @@ _mesa_meta_BlitFramebuffer(struct gl_context *ctx, extern void _mesa_meta_Clear(struct gl_context *ctx, GLbitfield buffers); +extern void +_mesa_meta_glsl_Clear(struct gl_context *ctx, GLbitfield buffers); + extern void _mesa_meta_CopyPixels(struct gl_context *ctx, GLint srcx, GLint srcy, GLsizei width, GLsizei height,