implement accum ops

src/mesa/state_tracker/st_cb_accum.c

@@ -35,21 +35,175 @@
 #include "main/macros.h"
 
 #include "st_context.h"
-#include "st_atom.h"
 #include "st_cache.h"
-#include "st_draw.h"
-#include "st_program.h"
 #include "st_cb_accum.h"
+#include "st_cb_fbo.h"
 #include "st_draw.h"
 #include "st_format.h"
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
 
 
+/**
+ * For hardware that supports deep color buffers, we could accelerate
+ * most/all the accum operations with blending/texturing.
+ * For now, just use the get/put_tile() functions and do things in software.
+ */
+
+
+/** For ADD/MULT */
+static void
+accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
+          GLint xpos, GLint ypos, GLint width, GLint height,
+          struct pipe_surface *acc_ps)
+{
+   GLfloat *accBuf;
+   GLint i;
+
+   accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+   (void) pipe->region_map(pipe, acc_ps->region);
+
+   acc_ps->get_tile(acc_ps, xpos, ypos, width, height, accBuf);
+
+   for (i = 0; i < 4 * width * height; i++) {
+      GLfloat val = accBuf[i] * scale + bias;
+      accBuf[i] = CLAMP(val, 0.0, 1.0);
+   }
+
+   acc_ps->put_tile(acc_ps, xpos, ypos, width, height, accBuf);
+
+   _mesa_free(accBuf);
+
+   pipe->region_unmap(pipe, acc_ps->region);
+}
+
+
+static void
+accum_accum(struct pipe_context *pipe, GLfloat value,
+            GLint xpos, GLint ypos, GLint width, GLint height,
+            struct pipe_surface *acc_ps,
+            struct pipe_surface *color_ps)
+{
+   ubyte *colorMap, *accMap;
+   GLfloat *colorBuf, *accBuf;
+   GLint i;
+
+   colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+   accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+   colorMap = pipe->region_map(pipe, color_ps->region);
+   accMap = pipe->region_map(pipe, acc_ps->region);
+
+   color_ps->get_tile(color_ps, xpos, ypos, width, height, colorBuf);
+   acc_ps->get_tile(acc_ps, xpos, ypos, width, height, accBuf);
+
+   for (i = 0; i < 4 * width * height; i++) {
+      GLfloat val = accBuf[i] + colorBuf[i] * value;
+      accBuf[i] = CLAMP(val, 0.0, 1.0);
+   }
+
+   acc_ps->put_tile(acc_ps, xpos, ypos, width, height, accBuf);
+
+   _mesa_free(colorBuf);
+   _mesa_free(accBuf);
+
+   pipe->region_unmap(pipe, color_ps->region);
+   pipe->region_unmap(pipe, acc_ps->region);
+}
+
+
+static void
+accum_load(struct pipe_context *pipe, GLfloat value,
+           GLint xpos, GLint ypos, GLint width, GLint height,
+           struct pipe_surface *acc_ps,
+           struct pipe_surface *color_ps)
+{
+   GLfloat *buf;
+   GLint i;
+
+   buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+   (void) pipe->region_map(pipe, color_ps->region);
+   (void) pipe->region_map(pipe, acc_ps->region);
+
+   color_ps->get_tile(color_ps, xpos, ypos, width, height, buf);
+
+   for (i = 0; i < 4 * width * height; i++) {
+      GLfloat val = buf[i] * value;
+      buf[i] = CLAMP(val, 0.0, 1.0);
+   }
+
+   acc_ps->put_tile(acc_ps, xpos, ypos, width, height, buf);
+
+   _mesa_free(buf);
+
+   pipe->region_unmap(pipe, color_ps->region);
+   pipe->region_unmap(pipe, acc_ps->region);
+}
+
+
+static void
+accum_return(GLcontext *ctx, GLfloat value,
+             GLint xpos, GLint ypos, GLint width, GLint height,
+             struct pipe_surface *acc_ps,
+             struct pipe_surface *color_ps)
+{
+   struct pipe_context *pipe = ctx->st->pipe;
+   const GLboolean writeR = ctx->Color.ColorMask[0];
+   const GLboolean writeG = ctx->Color.ColorMask[1];
+   const GLboolean writeB = ctx->Color.ColorMask[2];
+   const GLboolean writeA = ctx->Color.ColorMask[3];
+   GLfloat *buf;
+   GLint i;
+
+   buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+   (void) pipe->region_map(pipe, color_ps->region);
+   (void) pipe->region_map(pipe, acc_ps->region);
+
+   acc_ps->get_tile(acc_ps, xpos, ypos, width, height, buf);
+
+   for (i = 0; i < width * height; i++) {
+      if (writeR) {
+         GLfloat r = buf[i * 4 + 0] * value;
+         buf[i * 4 + 0] = CLAMP(r, 0.0, 1.0);
+      }
+      if (writeG) {
+         GLfloat g = buf[i * 4 + 1] * value;
+         buf[i * 4 + 1] = CLAMP(g, 0.0, 1.0);
+      }
+      if (writeB) {
+         GLfloat b = buf[i * 4 + 2] * value;
+         buf[i * 4 + 2] = CLAMP(b, 0.0, 1.0);
+      }
+      if (writeA) {
+         GLfloat a = buf[i * 4 + 3] * value;
+         buf[i * 4 + 3] = CLAMP(a, 0.0, 1.0);
+      }
+   }
+
+   color_ps->put_tile(color_ps, xpos, ypos, width, height, buf);
+
+   _mesa_free(buf);
+
+   pipe->region_unmap(pipe, color_ps->region);
+   pipe->region_unmap(pipe, acc_ps->region);
+}
+
 
 static void
 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 {
+   struct st_context *st = ctx->st;
+   struct pipe_context *pipe = st->pipe;
+   struct st_renderbuffer *acc_strb
+     = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+   struct st_renderbuffer *color_strb
+      = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
+   struct pipe_surface *acc_ps = acc_strb->surface;
+   struct pipe_surface *color_ps = color_strb->surface;
+
    const GLint xpos = ctx->DrawBuffer->_Xmin;
    const GLint ypos = ctx->DrawBuffer->_Ymin;
    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
@@ -58,24 +212,24 @@ st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
    switch (op) {
    case GL_ADD:
       if (value != 0.0F) {
-         accum_add(ctx, value, xpos, ypos, width, height);
+         accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
       }
       break;
    case GL_MULT:
       if (value != 1.0F) {
-         accum_mult(ctx, value, xpos, ypos, width, height);
+         accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
       }
       break;
    case GL_ACCUM:
       if (value != 0.0F) {
-         accum_accum(ctx, value, xpos, ypos, width, height);
+         accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
       }
       break;
    case GL_LOAD:
-      accum_load(ctx, value, xpos, ypos, width, height);
+      accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
       break;
    case GL_RETURN:
-      accum_return(ctx, value, xpos, ypos, width, height);
+      accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
       break;
    default:
       assert(0);