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-rw-r--r--src/gallium/auxiliary/util/u_draw_quad.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_draw_quad.c b/src/gallium/auxiliary/util/u_draw_quad.c
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+++ b/src/gallium/auxiliary/util/u_draw_quad.c
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+/**************************************************************************
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
+ *
+ **************************************************************************/
+
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_inlines.h"
+#include "pipe/p_winsys.h"
+#include "util/u_draw_quad.h"
+
+
+/**
+ * Draw a simple vertex buffer / primitive.
+ * Limited to float[4] vertex attribs, tightly packed.
+ */
+void
+util_draw_vertex_buffer(struct pipe_context *pipe,
+ struct pipe_buffer *vbuf,
+ uint prim_type,
+ uint num_verts,
+ uint num_attribs)
+{
+ struct pipe_vertex_buffer vbuffer;
+ struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
+ uint i;
+
+ assert(num_attribs <= PIPE_MAX_ATTRIBS);
+
+ /* tell pipe about the vertex buffer */
+ vbuffer.buffer = vbuf;
+ vbuffer.pitch = num_attribs * 4 * sizeof(float); /* vertex size */
+ vbuffer.buffer_offset = 0;
+ pipe->set_vertex_buffers(pipe, 1, &vbuffer);
+
+ /* tell pipe about the vertex attributes */
+ for (i = 0; i < num_attribs; i++) {
+ velements[i].src_offset = i * 4 * sizeof(float);
+ velements[i].vertex_buffer_index = 0;
+ velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
+ velements[i].nr_components = 4;
+ }
+ pipe->set_vertex_elements(pipe, num_attribs, velements);
+
+ /* draw */
+ pipe->draw_arrays(pipe, prim_type, 0, num_verts);
+}
+
+
+
+/**
+ * Draw screen-aligned textured quad.
+ * Note: this function allocs/destroys a vertex buffer and isn't especially
+ * efficient.
+ */
+void
+util_draw_texquad(struct pipe_context *pipe,
+ float x0, float y0, float x1, float y1, float z)
+{
+ struct pipe_buffer *vbuf;
+ uint numAttribs = 2, vertexBytes, i, j;
+
+ vertexBytes = 4 * (4 * numAttribs * sizeof(float));
+
+ /* XXX create one-time */
+ vbuf = pipe_buffer_create(pipe->screen, 32,
+ PIPE_BUFFER_USAGE_VERTEX, vertexBytes);
+ if (vbuf) {
+ float *v = (float *) pipe_buffer_map(pipe->screen, vbuf,
+ PIPE_BUFFER_USAGE_CPU_WRITE);
+ if (v) {
+ /*
+ * Load vertex buffer
+ */
+ for (i = j = 0; i < 4; i++) {
+ v[j + 2] = z; /* z */
+ v[j + 3] = 1.0; /* w */
+ v[j + 6] = 0.0; /* r */
+ v[j + 7] = 1.0; /* q */
+ j += 8;
+ }
+
+ v[0] = x0;
+ v[1] = y0;
+ v[4] = 0.0; /*s*/
+ v[5] = 0.0; /*t*/
+
+ v[8] = x1;
+ v[9] = y0;
+ v[12] = 1.0;
+ v[13] = 0.0;
+
+ v[16] = x1;
+ v[17] = y1;
+ v[20] = 1.0;
+ v[21] = 1.0;
+
+ v[24] = x0;
+ v[25] = y1;
+ v[28] = 0.0;
+ v[29] = 1.0;
+
+ pipe_buffer_unmap(pipe->screen, vbuf);
+ util_draw_vertex_buffer(pipe, vbuf, PIPE_PRIM_TRIANGLE_FAN, 4, 2);
+ }
+
+ pipe_buffer_reference(pipe->screen, &vbuf, NULL);
+ }
+}